/*
 * Copyright (C) 2011 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package ewan.android.droidjockey;

import android.media.AudioManager;
import android.util.Log;

import java.lang.reflect.Method;

/**
 * Contains methods to handle registering/unregistering remote control clients.
 * These methods only run on ICS devices. On previous devices, all methods are
 * no-ops.
 */
@SuppressWarnings({ "rawtypes" })
public class RemoteControlHelper {
	private static final String TAG = "RemoteControlHelper";

	private static boolean sHasRemoteControlAPIs = false;

	private static Method sRegisterRemoteControlClientMethod;
	private static Method sUnregisterRemoteControlClientMethod;

	static {
		try {
			ClassLoader classLoader = RemoteControlHelper.class
					.getClassLoader();
			Class sRemoteControlClientClass = RemoteControlClientCompat
					.getActualRemoteControlClientClass(classLoader);
			sRegisterRemoteControlClientMethod = AudioManager.class.getMethod(
					"registerRemoteControlClient",
					new Class[] { sRemoteControlClientClass });
			sUnregisterRemoteControlClientMethod = AudioManager.class
					.getMethod("unregisterRemoteControlClient",
							new Class[] { sRemoteControlClientClass });
			sHasRemoteControlAPIs = true;
		} catch (ClassNotFoundException e) {
			// Silently fail when running on an OS before ICS.
		} catch (NoSuchMethodException e) {
			// Silently fail when running on an OS before ICS.
		} catch (IllegalArgumentException e) {
			// Silently fail when running on an OS before ICS.
		} catch (SecurityException e) {
			// Silently fail when running on an OS before ICS.
		}
	}

	public static void registerRemoteControlClient(AudioManager audioManager,
			RemoteControlClientCompat remoteControlClient) {
		if (!sHasRemoteControlAPIs) {
			return;
		}

		try {
			sRegisterRemoteControlClientMethod.invoke(audioManager,
					remoteControlClient.getActualRemoteControlClientObject());
		} catch (Exception e) {
			Log.e(TAG, e.getMessage(), e);
		}
	}

	public static void unregisterRemoteControlClient(AudioManager audioManager,
			RemoteControlClientCompat remoteControlClient) {
		if (!sHasRemoteControlAPIs) {
			return;
		}

		try {
			sUnregisterRemoteControlClientMethod.invoke(audioManager,
					remoteControlClient.getActualRemoteControlClientObject());
		} catch (Exception e) {
			Log.e(TAG, e.getMessage(), e);
		}
	}
}
